To make a dye bath for the eggs, add 2 litres of water to a saucepan with 20g of your chosen Cool Chile product (the more you use, the more intense the colour will be), bring to a boil and simmer for 30 minutes. Then add 1-2tsp of vinegar.
In the meantime wash the eggs thoroughly. You can remove the stamp mark with a small amount of vinegar on a paper towel and gently rub it.
Add the eggs to your dye and boil for another 7-8 min. Keep them overnight for the best results. When ready, leave the eggs to dry on a paper towel (do not rub, as the dye can come off easily before it drys). Once dry, apply a small amount of oil with a paper towel and polish gently to make them glow.